fix: increase dropdown z-index to appear above logo (#24057)

- Change dropdown z-index from z-10 to z-50 to ensure dropdowns appear above navigation elements
- TopNav uses z-40, so dropdowns need higher z-index to be properly visible
- Fixes issue where Cal.com logo was appearing above dropdown menus

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: joeauyeung

packages/ui/components/dropdown/Dropdown.tsx

@@ -39,7 +39,7 @@ export const DropdownMenuContent = forwardRef<HTMLDivElement, DropdownMenuConten
         {...props}
         sideOffset={sideOffset}
         className={classNames(
-          "shadow-dropdown bg-default border-subtle relative z-10 origin-top-right space-y-[1px] rounded-xl border p-1 text-sm",
+          "shadow-dropdown bg-default border-subtle relative z-50 origin-top-right space-y-[1px] rounded-xl border p-1 text-sm",
           "w-[220px]",
           props.className
         )}